I opened my fully synced Bitcoin Core client today and sent one transaction which confirmed successfully.

Then I opened the client again after some time, it was synced too and then I sent another transaction. But this time, when I go to transactions tab, it shows a "?" symbol next to all the transactions in the past which were confirmed as well and even the newly initiated transaction.

I looked up the transaction id of the most recent transaction on the blockchain explorer and I can't find it.

What do I do now? The balance has been deducted already from my Wallet but transaction id is not showing up.

I checked on the lower right of the Bitcoin Core GUI and it shows that it is connected to Bitcoin network (2 connections).